Day18 fixed

Day 18/decode.py

@@ -1,36 +1,9 @@
-unk_100007F50 = [0x03, 0x20, 0x63, 0x46, 0x61, 0xB6, 0x3C, 0xAF, 0xAA, 0x76, 0xC2, 0x7E, 0xEA, 0x00, 0xB5, 0x98]
-a4 = -5678246756302764783
+from Crypto.Cipher import Salsa20
 
-# input = "096CD446EBC8E04D2FDE299BE44F322863F7A37C18763554EEE4C99C3FAD15"
-# print(len(input), len(unk_100007F50))
+KEY       = bytearray.fromhex("0320634661B63CAFAA76C27EEA00B59BFB2F7097214FD04CB257AC2904EFEE46")
+NONCE     = bytearray.fromhex("B132D0A8E78F4511")[::-1]
+ENCRYPTED = bytearray.fromhex("096CD446EBC8E04D2FDE299BE44F322863F7A37C18763554EEE4C99C3FAD15")
 
-def dance_words():
-    pass
-
-def dance_block(buf, unk, const, num):
-    pass
-
-def dance(input):
-    if len(input) > 0:
-        v4 = -567824675630276478
-        v5 = unk_100007F50
-        v6 = len(input)
-        v7 = input
-        v8 = 0
-        v9 = [0] * 64
-
-        while True:
-
-            if v8 == 0:
-                dance_block(v9, v5, v4, 0)
-
-            v7[v8] = ord(v7[v8]) ^ v9[0]
-            v8 = v8 + 1
-            if v6 == v8:
-                break
-
-        return v7
-
-input = ["0"] * 32
-output = dance(input)
-print(output)
+cipher = Salsa20.new(key=KEY, nonce=NONCE)
+plaintext = cipher.decrypt(ENCRYPTED)
+print(plaintext.decode("UTF-8"))